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Mercedes Pastor-Blas, M. M. "Compatibility Improvement between Chlorinated Thermoplastic Rubber and Polychloroprene Adhesive". Rubber Chemistry and Technology 82, nr 1 (1.03.2009): 18–36. http://dx.doi.org/10.5254/1.3548238.
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Abstract Traditionally, it has been believed that there is an incompatibility between the chlorinated rubber surface and polychloroprene adhesives resulting in a lack of adhesion. However, in this study it has been shown that a polychloroprene adhesive (PCP30P) produces similar T-peel strength values when using a polyurethane (PU) adhesive in joints produced between a chlorinated thermoplastic SBS rubber and roughened leather. In both cases a cohesive failure mode within the rubber was obtained. This polychloroprene adhesive (PCP30P) contains a thermoreactive phenolic resin in its formulation. The nature of the resin greatly influences the viscoelastic properties of the polychloroprene adhesive. Thus, polychloroprene adhesive with no resin or with resins of a different nature do not produce suitable adhesive joints between the chlorinated rubber and the leather (Terpene phenolic resin (PCP30TP), a glycerol esther colofony resin (PCP30EC) and an aromatic hydrocarbon resin (PCP30AH) were studied). The interactions produced between the chlorinating agent and the adhesive were studied by ATR-IR on solid films of the polychloroprene adhesives and the tackifier resins previously immersed in the chlorinating solution (0.5 and 3 wt% TCI/MEK). All the polychloroprene adhesives were modified by the chlorinating agent, being capable of producing a good interaction with the chlorinated rubber surface at the interface. Therefore, the good performance of the PCP30P adhesive compared with the other polychloroprene adhesives has been ascribed to rheological behavior more similar to the PU adhesive assessed by DMTA. The PCP30P adhesive is the most elastic material among all the considered polychloroprene adhesives. This increased elasticity and better viscoelastic properties are imparted by the thermoreactive phenolic resin in its formulation.
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Feng, Chen, Fang Wang, Zheng Xu, Huilin Sui, Yong Fang, Xiaozhi Tang i Xinchun Shen. "Characterization of Soybean Protein Adhesives Modified by Xanthan Gum". Coatings 8, nr 10 (26.09.2018): 342. http://dx.doi.org/10.3390/coatings8100342.
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The aim of this study was to provide a basis for the preparation of medical adhesives from soybean protein sources. Soybean protein (SP) adhesives mixed with different concentrations of xanthan gum (XG) were prepared. Their adhesive features were evaluated by physicochemical parameters and an in vitro bone adhesion assay. The results showed that the maximal adhesion strength was achieved in 5% SP adhesive with 0.5% XG addition, which was 2.6-fold higher than the SP alone. The addition of XG significantly increased the hydrogen bond and viscosity, as well as increased the β-sheet content but decreased the α-helix content in the second structure of protein. X-ray diffraction data showed significant interactions between SP molecules and XG. Scanning electron microscopy observations showed that the surface of SP adhesive modified by XG was more viscous and compact, which were favorable for the adhesion between the adhesive and bone. In summary, XG modification caused an increase in the hydrogen bonding and zero-shear viscosity of SP adhesives, leading to a significant increase in the bond strength of SP adhesives onto porcine bones.
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Narayanan, Amal, Ali Dhinojwala i Abraham Joy. "Design principles for creating synthetic underwater adhesives". Chemical Society Reviews 50, nr 23 (2021): 13321–45. http://dx.doi.org/10.1039/d1cs00316j.
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Water prevents adhesion by disrupting the interfacial interactions and weakening the cohesive network of the adhesive. This review summarizes the recent developments in the physical and chemical design principles of underwater adhesives.
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Taylor, James T., Rebekka Harting, Samer Shalaby, Charles M. Kenerley, Gerhard H. Braus i Benjamin A. Horwitz. "Adhesion as a Focus in Trichoderma–Root Interactions". Journal of Fungi 8, nr 4 (6.04.2022): 372. http://dx.doi.org/10.3390/jof8040372.
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Fungal spores, germlings, and mycelia adhere to substrates, including host tissues. The adhesive forces depend on the substrate and on the adhesins, the fungal cell surface proteins. Attachment is often a prerequisite for the invasion of the host, hence its importance. Adhesion visibly precedes colonization of root surfaces and outer cortex layers, but little is known about the molecular details. We propose that by starting from what is already known from other fungi, including yeast and other filamentous pathogens and symbionts, the mechanism and function of Trichoderma adhesion will become accessible. There is a sequence, and perhaps functional, homology to other rhizosphere-competent Sordariomycetes. Specifically, Verticillium dahliae is a soil-borne pathogen that establishes itself in the xylem and causes destructive wilt disease. Metarhizium species are best-known as insect pathogens with biocontrol potential, but they also colonize roots. Verticillium orthologs of the yeast Flo8 transcription factor, Som1, and several other relevant genes are already under study for their roles in adhesion. Metarhizium encodes relevant adhesins. Trichoderma virens encodes homologs of Som1, as well as adhesin candidates. These genes should provide exciting leads toward the first step in the establishment of beneficial interactions with roots in the rhizosphere.
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Klingelhofer, J., R. B. Troyanovsky, O. Y. Laur i S. Troyanovsky. "Amino-terminal domain of classic cadherins determines the specificity of the adhesive interactions". Journal of Cell Science 113, nr 16 (15.08.2000): 2829–36. http://dx.doi.org/10.1242/jcs.113.16.2829.
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Classic cadherins are transmembrane receptors involved in cell type-specific calcium-dependent intercellular adhesion. The specificity of adhesion is mediated by homophilic interactions between cadherins extending from opposing cell surfaces. In addition, classic cadherins can self-associate forming lateral dimers. Whereas it is widely excepted that lateral dimerization of cadherins is critical for adhesion, details of this process are not known. Yet, no evidence for physical association between different classic cadherins in cells expressing complex cadherin patterns has been reported. To study lateral and adhesive intercadherin interactions, we examined interactions between two classic cadherins, E- and P-cadherins, in epithelial A-431 cells co-producing both proteins. We showed that these cells exhibited heterocomplexes consisting of laterally assembled E- and P-cadherins. These complexes were formed by a mechanism involving Trp(156) of E-cadherin. Removal of calcium ions from the culture medium triggered a novel Trp(156)-independent type of lateral E-cadherin-P-cadherin association. Notably, an antiparallel (adhesive) mode of interaction between these cadherins was negligible. The specificity of adhesive interaction was localized to the amino-terminal (EC1) domain of both cadherins. Thus, EC1 domain of classic cadherins exposes two determinants responsible for nonspecific lateral and cadherin type-specific adhesive dimerization.
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Kan, Anton, Ilenne Del Valle, Tim Rudge, Fernán Federici i Jim Haseloff. "Intercellular adhesion promotes clonal mixing in growing bacterial populations". Journal of The Royal Society Interface 15, nr 146 (wrzesień 2018): 20180406. http://dx.doi.org/10.1098/rsif.2018.0406.
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Dense bacterial communities, known as biofilms, can have functional spatial organization driven by self-organizing chemical and physical interactions between cells, and their environment. In this work, we investigated intercellular adhesion, a pervasive property of bacteria in biofilms, to identify effects on the internal structure of bacterial colonies. We expressed the self-recognizing ag43 adhesin protein in Escherichia coli to generate adhesion between cells, which caused aggregation in liquid culture and altered microcolony morphology on solid media. We combined the adhesive phenotype with an artificial colony patterning system based on plasmid segregation, which marked clonal lineage domains in colonies grown from single cells. Engineered E. coli were grown to colonies containing domains with varying adhesive properties, and investigated with microscopy, image processing and computational modelling techniques. We found that intercellular adhesion elongated the fractal-like boundary between cell lineages only when both domains within the colony were adhesive, by increasing the rotational motion during colony growth. Our work demonstrates that adhesive intercellular interactions can have significant effects on the spatial organization of bacterial populations, which can be exploited for biofilm engineering. Furthermore, our approach provides a robust platform to study the influence of intercellular interactions on spatial structure in bacterial populations.
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Wilson, James G. "Adhesive Interactions in Hemopoiesis". Acta Haematologica 97, nr 1-2 (1997): 6–12. http://dx.doi.org/10.1159/000203654.
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Rosenfeld, Stephen J., i Harvey R. Gralnick. "Adhesive Interactions in Hemostasis". Acta Haematologica 97, nr 1-2 (1997): 118–25. http://dx.doi.org/10.1159/000203667.
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Pradyawong, Sarocha, Guangyan Qi, Meng Zhang, Xiuzhi S. Sun i Donghai Wang. "Effect of pH and pH-Shifting on Adhesion Performance and Properties of Lignin-Protein Adhesives". Transactions of the ASABE 64, nr 4 (2021): 1141–52. http://dx.doi.org/10.13031/trans.14465.
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HighlightsLignin improved the wet adhesion strength of soy protein adhesives when pH shifted from 8.5 to 4.5.Lignin increased the water resistance of soy protein adhesives from 5% to 40% at pH 12.Lignin improved the thermal resistance of soy protein adhesives.pH and pH-shifting treatments led to property changes of lignin, soy protein, and lignin-soy protein.Abstract. Concerns about public health and the environment have created strong interest in developing alternative green products. The focus of this research was to study the effect of lignin on soy protein (SP) adhesives under different pH and pH-shifting treatments. Additionally, this research was designed to understand the consequence of pH and pH-shifting treatments on the adhesion performance of SP and lignin-SP (LSP) adhesives as well as the characteristics, solubility, glue line patterns, and physiochemical properties. To study the aggregation, soluble, and denatured stages of protein, the protein solutions were adjusted to pH 4.5, 8.5, and 12, respectively. In addition, the study of pH-shifting treatments was performed at pH 8.5 and 12 to unfold and denature the protein, respectively. The protein structure was then refolded by adjusting the pH to 4.5 in adhesive slurries. The adhesives presented good adhesion performance under dry conditions with wood failure in most treatments, while satisfactory wet adhesion performance was obtained at pH 4.5, 8.5 to 4.5, and 12. Shifting the pH from 8.5 to 4.5 increased the lignin-protein interaction and provided the best improvement in adhesion performance. Lignin strengthened the protein structure, increased the water resistance, and improved the thermal stability of SP adhesives. At an extremely high pH, the water resistance of SP increased from 5% to 40% with the addition of lignin. Lignin showed great potential for increasing the wet strength of SP adhesives. The SP and LSP properties and adhesion performance could be adjusted and improved by pH and pH-shifting processes. Lignin-SP interactions, water resistance, and glue line pattern proved to be significant factors contributing to adhesion performance. Keywords: Adhesive, Lignin, Lignin-protein interactions, pH, pH-Shifting, Protein.
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Lipke, Peter N., Jason M. Rauceo i Albertus Viljoen. "Cell–Cell Mating Interactions: Overview and Potential of Single-Cell Force Spectroscopy". International Journal of Molecular Sciences 23, nr 3 (20.01.2022): 1110. http://dx.doi.org/10.3390/ijms23031110.
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It is an understatement that mating and DNA transfer are key events for living organisms. Among the traits needed to facilitate mating, cell adhesion between gametes is a universal requirement. Thus, there should be specific properties for the adhesion proteins involved in mating. Biochemical and biophysical studies have revealed structural information about mating adhesins, as well as their specificities and affinities, leading to some ideas about these specialized adhesion proteins. Recently, single-cell force spectroscopy (SCFS) has added important findings. In SCFS, mating cells are brought into contact in an atomic force microscope (AFM), and the adhesive forces are monitored through the course of mating. The results have shown some remarkable characteristics of mating adhesins and add knowledge about the design and evolution of mating adhesins.
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Guttmann, Robin, Johannes Hoja, Christoph Lechner, Reinhard J. Maurer i Alexander F. Sax. "Adhesion, forces and the stability of interfaces". Beilstein Journal of Organic Chemistry 15 (11.01.2019): 106–29. http://dx.doi.org/10.3762/bjoc.15.12.
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Weak molecular interactions (WMI) are responsible for processes such as physisorption; they are essential for the structure and stability of interfaces, and for bulk properties of liquids and molecular crystals. The dispersion interaction is one of the four basic interactions types – electrostatics, induction, dispersion and exchange repulsion – of which all WMIs are composed. The fact that each class of basic interactions covers a wide range explains the large variety of WMIs. To some of them, special names are assigned, such as hydrogen bonding or hydrophobic interactions. In chemistry, these WMIs are frequently used as if they were basic interaction types. For a long time, dispersion was largely ignored in chemistry, attractive intermolecular interactions were nearly exclusively attributed to electrostatic interactions. We discuss the importance of dispersion interactions for the stabilization in systems that are traditionally explained in terms of the “special interactions” mentioned above. System stabilization can be explained by using interaction energies, or by attractive forces between the interacting subsystems; in the case of stabilizing WMIs, one frequently speaks of adhesion energies and adhesive forces. We show that the description of system stability using maximum adhesive forces and the description using adhesion energies are not equivalent. The systems discussed are polyaromatic molecules adsorbed to graphene and carbon nanotubes; dimers of alcohols and amines; cellulose crystals; and alcohols adsorbed onto cellulose surfaces.
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Shen, Xinchun, Xiaoqun Mo, Robyn Moore, Shawnalea J. Frazier, Takeo Iwamoto, John M. Tomich i Xiuzhi Susan Sun. "Adhesion and Structure Properties of Protein Nanomaterials Containing Hydrophobic and Charged Amino Acids". Journal of Nanoscience and Nanotechnology 6, nr 3 (1.03.2006): 837–44. http://dx.doi.org/10.1166/jnn.2006.126.
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Protein polymers are being used or considered for biobased adhesives and coating materials. Most adhesives derived from macro protein molecules work through receptors or cross-links to bring about adhesion. The adhesion mechanism of protein polymers would lead to better understanding of adhesives and the discovery of new practical properties of protein polymers at both nano- and macro-scales. The objective of this research work was to study adhesion properties of protein polymers at nanoscale (a peptide adhesive with nanometer-scale units that range in size of several nanometers, defined as protein nanomaterial). Seven protein nanomaterial samples with different degrees of adhesive strength were designed and synthesized using solid phase chemistries. All protein nanomaterials contain a common hydrophobic core flanked by charged amino acid sequences. The adhesion properties of the protein nanomaterials were investigated at different pH values and curing temperatures. The protein nanomaterials self aggregate and interact with the wood surface. The protein nanomaterial KKK-FLIVIGSII-KKK identified in this study had high adhesive strength toward wood. It had the highest shear strength at pH 12, with an amino acid sequence that was very hydrophobic and uncharged. This protein nanomaterial underwent structural analyses using circular dichroism, laser-Fourier transform infrared, and laser desorption mass spectrometry. At pH 12 this peptide adopted a pH-induced beta-like conformation. Adhesive strength reflects contributions of both hydrogen bonding and van der Waals interactions. Ionic and covalent bonds do not appear to be significant factors for adhesion in this study.
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Cotter, Shane E., Neeraj K. Surana, Susan Grass i Joseph W. St. Geme. "Trimeric Autotransporters Require Trimerization of the Passenger Domain for Stability and Adhesive Activity". Journal of Bacteriology 188, nr 15 (1.08.2006): 5400–5407. http://dx.doi.org/10.1128/jb.00164-06.
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ABSTRACT In recent years, structural studies have identified a number of bacterial, viral, and eukaryotic adhesive proteins that have a trimeric architecture. The prototype examples in bacteria are the Haemophilus influenzae Hia adhesin and the Yersinia enterocolitica YadA adhesin. Both Hia and YadA are members of the trimeric-autotransporter subfamily and are characterized by an internal passenger domain that harbors adhesive activity and a short C-terminal translocator domain that inserts into the outer membrane and facilitates delivery of the passenger domain to the bacterial surface. In this study, we examined the relationship between trimerization of the Hia and YadA passenger domains and the capacity for adhesive activity. We found that subunit-subunit interactions and stable trimerization are essential for native folding and stability and ultimately for full-level adhesive activity. These results raise the possibility that disruption of the trimeric architecture of trimeric autotransporters, and possibly other trimeric adhesins, may be an effective strategy to eliminate adhesive activity.
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Yamate, Taiki, Takayuki Fujiwara, Toru Yamaguchi, Hiroshi Suzuki i Motohiro Akazome. "Exploiting CH/π interactions in robust supramolecular adhesives". Polymer Chemistry 9, nr 32 (2018): 4303–8. http://dx.doi.org/10.1039/c8py00592c.
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Ramachandran, Arun, Travers H. Anderson, L. Gary Leal i Jacob N. Israelachvili. "Adhesive Interactions between Vesicles in the Strong Adhesion Limit". Langmuir 27, nr 1 (4.01.2011): 59–73. http://dx.doi.org/10.1021/la1023168.
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Liang, Shile, i Cheng Dong. "Integrin VLA-4 enhances sialyl-Lewisx/a-negative melanoma adhesion to and extravasation through the endothelium under low flow conditions". American Journal of Physiology-Cell Physiology 295, nr 3 (wrzesień 2008): C701—C707. http://dx.doi.org/10.1152/ajpcell.00245.2008.
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During their passage through the circulatory system, tumor cells undergo extensive interactions with various host cells including endothelial cells. The capacity of tumor cells to form metastasis is related to their ability to interact with and extravasate through endothelial cell layers, which involves multiple adhesive interactions between tumor cells and endothelium (EC). Thus it is essential to identify the adhesive receptors on the endothelial and melanoma surface that mediate those specific adhesive interactions. P-selectin and E-selectin have been reported as adhesion molecules that mediate the cell-cell interaction of endothelial cells and melanoma cells. However, not all melanoma cells express ligands for selectins. In this study, we elucidated the molecular constituents involved in the endothelial adhesion and extravasation of sialyl-Lewisx/a-negative melanoma cell lines under flow in the presence and absence of polymorphonuclear neutrophils (PMNs). Results show the interactions of α4β1(VLA-4) on sialyl-Lewisx/a-negative melanoma cells and vascular adhesion molecule (VCAM-1) on inflamed EC supported melanoma adhesion to and subsequent extravasation through the EC in low shear flow. These findings provide clear evidence for a direct role of the VLA-4/VCAM-1 pathway in melanoma cell adhesion to and extravasation through the vascular endothelium in a shear flow. PMNs facilitated melanoma cell extravasation under both low and high shear conditions via the involvement of distinct molecular mechanisms. In the low shear regime, β2-integrins were sufficient to enhance melanoma cell extravasation, whereas in the high shear regime, selectin ligands and β2-integrins on PMNs were necessary for facilitating the melanoma extravasation process.
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Lu, Qingye, Eric Danner, J. Herbert Waite, Jacob N. Israelachvili, Hongbo Zeng i Dong Soo Hwang. "Adhesion of mussel foot proteins to different substrate surfaces". Journal of The Royal Society Interface 10, nr 79 (6.02.2013): 20120759. http://dx.doi.org/10.1098/rsif.2012.0759.
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Mussel foot proteins (mfps) have been investigated as a source of inspiration for the design of underwater coatings and adhesives. Recent analysis of various mfps by a surface forces apparatus (SFA) revealed that mfp-1 functions as a coating, whereas mfp-3 and mfp-5 resemble adhesive primers on mica surfaces. To further refine and elaborate the surface properties of mfps, the force–distance profiles of the interactions between thin mfp (i.e. mfp-1, mfp-3 or mfp-5) films and four different surface chemistries, namely mica, silicon dioxide, polymethylmethacrylate and polystyrene, were measured by an SFA. The results indicate that the adhesion was exquisitely dependent on the mfp tested, the substrate surface chemistry and the contact time. Such studies are essential for understanding the adhesive versatility of mfps and related/similar adhesion proteins, and for translating this versatility into a new generation of coatings and (including in vivo ) adhesive materials.
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Chavakis, Triantafyllos, Valeria Orlova, Kaimei Song, Cornelia L. Andrei-Selmer i Sentot Santoso. "Heterophilic and Homophilic Interactions of Junctional Adhesion Molecule-C (JAM-C) Mediate Different Intercellular Adhesive Interactions." Blood 106, nr 11 (16.11.2005): 534. http://dx.doi.org/10.1182/blood.v106.11.534.534.
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Abstract Junctional adhesion molecules (JAM) are a new subfamily of the Ig superfamily. We recently identified that the third member of this family, JAM-C, expressed on endothelial, epithelial cells and platelets (i) undergoes a heterophilic interaction with leukocyte β2-integrin Mac-1 (CD11b/CD18) (J Exp Med. 2002; 196:679–91) and (ii) that endothelial JAM-C is predominantly localized within tight junctions and mediates neutrophil transendothelial migration in a Mac-1-dependent manner in vitro and in vivo (J Biol Chem. 2004, 279:55602–8). Here, we characterized JAM-C to undergo a homophilic interaction that participates in tumor cell-endothelial cell interactions. As assessed in a purified system, recombinant soluble JAM-C in fluid phase bound to immobilized JAM-C; moreover, JAM-C-transfected CHO cells adhered to immobilized JAM-C. The homophilic interaction of JAM-C was mediated by the isolated amino-terminal Ig-domain (D1) but not the carboxy-terminal Ig-domain (D2) of the molecule. Dimerization of JAM-A is dependent on the sequence RVE in the aminoterminal Ig-domain. This motif is conserved in JAM-C (R64I65E66) and a single amino acid mutation in this motif (E66R) abolished the homophilic interaction of JAM-C. The lung carcinoma cell line NCI-H522 was found to be positive for JAM-C expression. NCI-H522 cells adhered to immobilized JAM-C, as well as to JAM-C-transfected CHO cells, but not to mock-transfected CHO cells or to CHO cells transfected with the JAM-C mutant (E66R). Adhesion of NCI-H522 cells to JAM-C protein or JAM-C-transfected CHO cells was abolished in the presence of soluble JAM-C or the isolated D1. Furthermore, the adhesion of NCI-H522 cells to endothelial cells was significantly blocked by soluble JAM-C or the isolated D1. Thus, JAM-C undergoes a homophilic interaction via the R64I65E66 motif on the membrane-distal Ig-domain of the molecule. The homophilic interaction of JAM-C can mediate tumor cell-endothelial cell interactions and may thereby be involved in the process of tumor cell metastasis. Together, the heterophilic and homophilic interactions of JAM-C mediate distinct adhesive interactions.
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Preissner, K. T., i T. Chavakis. "Integrin-mediated leukocyte adhesive interactions". Hämostaseologie 25, nr 01 (2005): 33–38. http://dx.doi.org/10.1055/s-0037-1619645.
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SummaryLeukocyte recruitment to sites of inflammation, infection or vascular injury is a complex event that is orchestrated by a tightly coordinated sequence of interactions between leukocytes and cells of the vessel wall, especially endothelial cells. These interactions are controlled by the expression and activation of various adhesion receptors and protease systems.This review will focus on novel aspects of the regulation of integrin-dependent leukocyte adhesion by haemostatic factors. Here, so-called non-haemostatic properties of endogenous proteins such as high molecular weight kininogen, urokinase receptor, urokinase, as well as plasminogen and its cleavage product angiostatin in leukocyte adhesion and transmigration will be summarized. The crosstalk between haemostatic factors and inflammatory reactions may contribute to a better understanding of inflammatory vascular disorders and to the development of novel therapeutical concepts.
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Zhu, Jianjun, i Jayendran C. Rasaiah. "Unsymmetrical electrolytes with adhesive interactions". Journal of Chemical Physics 94, nr 4 (15.02.1991): 3141–49. http://dx.doi.org/10.1063/1.459784.
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Crooks, J., C. Mariott, G. Martin, T. Paget i D. Hassal. "Adhesive interactions between cell membranes". European Journal of Pharmaceutical Sciences 4 (wrzesień 1996): S195. http://dx.doi.org/10.1016/s0928-0987(97)86595-5.
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HAMMER, D. "P2. Cell-cell adhesive interactions". Biorheology 32, nr 2-3 (marzec 1995): 101. http://dx.doi.org/10.1016/0006-355x(95)91942-v.
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Djouani, Fatma, Carole Connan, Michel Delamar, Mohamed M. Chehimi i Karim Benzarti. "Cement paste–epoxy adhesive interactions". Construction and Building Materials 25, nr 2 (luty 2011): 411–23. http://dx.doi.org/10.1016/j.conbuildmat.2010.02.035.
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Kreft, Bertolt, Dietmar Berndorff, Anja Böttinger, Silvia Finnemann, Doris Wedlich, Michael Hortsch, Rudolf Tauber i Reinhard Geßner. "LI-Cadherin–mediated Cell–Cell Adhesion Does Not Require Cytoplasmic Interactions". Journal of Cell Biology 136, nr 5 (10.03.1997): 1109–21. http://dx.doi.org/10.1083/jcb.136.5.1109.
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The adhesive function of classical cadherins depends on the association with cytoplasmic proteins, termed catenins, which serve as a link between cadherins and the actin cytoskeleton. LI-cadherin, a structurally different member of the cadherin family, mediates Ca2+-dependent cell–cell adhesion, although its markedly short cytoplasmic domain exhibits no homology to this highly conserved region of classical cadherins. We now examined whether the adhesive function of LI-cadherin depends on the interaction with catenins, the actin cytoskeleton or other cytoplasmic components. In contrast to classical cadherins, LI-cadherin, when expressed in mouse L cells, was neither associated with catenins nor did it induce an upregulation of β-catenin. Consistent with these findings, LI-cadherin was not resistant to detergent extraction and did not induce a reorganization of the actin cytoskeleton. However, LI-cadherin was still able to mediate Ca2+dependent cell–cell adhesion. To analyze whether this function requires any interaction with proteins other than catenins, a glycosyl phosphatidylinositol–anchored form of LI-cadherin (LI-cadherinGPI) was constructed and expressed in Drosophila S2 cells. The mutant protein was able to induce Ca2+-dependent, homophilic cell–cell adhesion, and its adhesive properties were indistinguishable from those of wild type LI-cadherin. These findings indicate that the adhesive function of LI-cadherin is independent of any interaction with cytoplasmic components, and consequently should not be sensitive to regulatory mechanisms affecting the binding of classical cadherins to catenins and to the cytoskeleton. Thus, we postulate that the adhesive function of LI-cadherin is complementary to that of coexpressed classical cadherins ensuring cell–cell contacts even under conditions that downregulate the function of classical cadherins.
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Léger, Liliane, i Costantino Creton. "Adhesion mechanisms at soft polymer interfaces". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 366, nr 1869 (20.12.2007): 1425–42. http://dx.doi.org/10.1098/rsta.2007.2166.
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Based on several significant examples, we analyse the adhesion mechanisms at soft polymer interfaces with a special emphasis first on the role of connector molecules, that is, polymer chains bound to the interface and which transmit stress through a stretching and extraction mechanism, and second on the necessary relay that must be taken by additional dissipation mechanisms acting at larger scales if one wants to reach typical fracture toughnesses in the range of a few 10 J m −2 . Examples of such bulk dissipation mechanisms will be discussed for interfaces between polymer melts and for pressure-sensitive adhesives in contact with a solid surface. We shall particularly point out the fact that the level of adhesion results from a competition between adhesive failure usually driven by both the interactions and the friction properties of the interface and bulk strong deformations which take place in the bulk of the adhesive layer. Controlling the friction properties of the interface then becomes a tool to finely tune adhesive properties.
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Roosjen, Astrid, Henk J. Busscher, Willem Norde i Henny C. van der Mei. "Bacterial factors influencing adhesion of Pseudomonas aeruginosa strains to a poly(ethylene oxide) brush". Microbiology 152, nr 9 (1.09.2006): 2673–82. http://dx.doi.org/10.1099/mic.0.29005-0.
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Most bacterial strains adhere poorly to poly(ethylene oxide) (PEO)-brush coatings, with the exception of a Pseudomonas aeruginosa strain. The aim of this study was to find factors determining whether P. aeruginosa strains do or do not adhere to a PEO-brush coating in a parallel plate flow chamber. On the basis of their adhesion, a distinction could be made between three adhesive and three non-adhesive strains of P. aeruginosa, while bacterial motilities and zeta potentials were comparable for all six strains. However, water contact angles indicated that the adhesive strains were much more hydrophobic than the non-adhesive strains. Furthermore, only adhesive strains released surfactive extracellular substances, which may be engaged in attractive interactions with the PEO chains. Atomic force microscopy showed that the adhesion energy, measured from the retract curves of a bacterial-coated cantilever from a brush coating, was significantly more negative for adhesive strains than for non-adhesive strains (P<0.001). Through surface thermodynamic and extended-DLVO (Derjaguin, Landau, Verwey, Overbeek) analyses, these stronger adhesion energies could be attributed to acid–base interactions. However, the energies of adhesion of all strains to a brush coating were small when compared with their energies of adhesion to a glass surface. Accordingly, even the adhesive P. aeruginosa strains could be easily removed from a PEO-brush coating by the passage of a liquid–air interface. In conclusion, cell surface hydrophobicity and surfactant release are the main factors involved in adhesion of P. aeruginosa strains to PEO-brush coatings.
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Parkos, Charles A. "I. Neutrophil adhesive interactions with intestinal epithelium". American Journal of Physiology-Gastrointestinal and Liver Physiology 273, nr 4 (1.10.1997): G763—G768. http://dx.doi.org/10.1152/ajpgi.1997.273.4.g763.
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In many inflammatory conditions of the gastrointestinal tract, disease activity and patient symptoms correlate with the histological finding of neutrophil (PMN) migration across the epithelium. PMN interactions with intestinal epithelium can influence epithelial functions ranging from barrier maintenance to electrolyte secretion. Additionally, PMN recruitment to the epithelium can be modulated by epithelial interactions with luminal enteric pathogens. Adhesive interactions between PMN and intestinal epithelial cells have been shown to be distinct from interactions of PMN with endothelia. In particular, PMN transepithelial migration is modulated by a distinct array of cytokines including interferon-γ and interleukin-4 and requires the PMN β2-integrin CD11b/CD18 but is independent of CD11a/CD18, selectins, and intercellular adhesion molecule 1. Additionally, an integral membrane protein termed CD47 has recently been shown to play an important role in PMN transepithelial migration at point(s) subsequent to initial adhesive interactions. This article provides a brief overview of PMN interactions with epithelia and their functional consequences in relation to inflammatory disease.
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Doro, Fabio, Cinzia Colombo, Chiara Alberti, Daniela Arosio, Laura Belvisi, Cesare Casagrande, Roberto Fanelli i in. "Computational design of novel peptidomimetic inhibitors of cadherin homophilic interactions". Organic & Biomolecular Chemistry 13, nr 9 (2015): 2570–73. http://dx.doi.org/10.1039/c4ob02538e.
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Jonker, Jaimie-Leigh, Liam Morrison, Edward P. Lynch, Ingo Grunwald, Janek von Byern i Anne Marie Power. "The chemistry of stalked barnacle adhesive ( Lepas anatifera )". Interface Focus 5, nr 1 (6.02.2015): 20140062. http://dx.doi.org/10.1098/rsfs.2014.0062.
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The results of the first chemical analysis of the adhesive of Lepas anatifera , a stalked barnacle, are presented. A variety of elements were identified in scanning electron microscopy with energy dispersive spectrometry (SEM-EDS) of the adhesive, including Na, Mg, Ca, Cl, S, Al, Si, K and Fe; however, protein–metal interactions were not detected in Raman spectra of the adhesive. Elemental signatures from SEM-EDS of L. anatifera adhesive glands were less varied. Phosphorous was mostly absent in adhesive samples; supporting previous studies showing that phosphoserines do not play a significant role in adult barnacle adhesion. Disulfide bridges arising from Cys dimers were also investigated; Raman analysis showed weak evidence for S–S bonds in L. anatifera . In addition, there was no calcium carbonate signal in the attenuated total reflectance Fourier transform infrared spectra of L. anatifera adhesive, unlike several previous studies in other barnacle species. Significant differences were observed between the Raman spectra of L. anatifera and Balanus crenatus ; these and a range of Raman peaks in the L. anatifera adhesive are discussed. Polysaccharide was detected in L. anatifera adhesive but the significance of this awaits further experiments. The results demonstrate some of the diversity within barnacle species in the chemistry of their adhesives.
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Cao, Yuansheng, Richa Karmakar, Elisabeth Ghabache, Edgar Gutierrez, Yanxiang Zhao, Alex Groisman, Herbert Levine, Brian A. Camley i Wouter-Jan Rappel. "Cell motility dependence on adhesive wetting". Soft Matter 15, nr 9 (2019): 2043–50. http://dx.doi.org/10.1039/c8sm01832d.
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Федотова, Ольга Борисовна. "Theory and practice of adhesive interactions in the field of milk processing". Food processing industry, nr 8 (5.08.2021): 22–24. http://dx.doi.org/10.52653/ppi.2021.8.8.005.
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Механизмы формирования адгезионного контакта, изучение адгезионной способности тех или других веществ и управление ею в различных технологических процессах, формирование требуемой адгезионной прочности соединений - это многообразные проблемы в области техники и технологии. Рассмотрены понятие «адгезия» и базовые теории адгезионных взаимодействий, базирующихся на различных подходах: молекулярная, которая также называется адсорбционной, диффузионная, механическая, химическая, электрическая, релаксационная, слабого граничного слоя. Универсальности в объяснении тех или иных процессов формирования адгезионных соединений нет. Адгезионные соединения, образуемые в процессе переработки молока, носят нежелательный характер и приводят к потерям продукции и нарушению санитарно-гигиенического состояния производств вследствие образования белковых, жировых и комбинированных загрязнений на поверхностях различного оборудования. Соответственно требуются глубокие научные и практические исследования как по изучению механизмов образования адгезионных соединений, так и по их удалению. Interaction with other people the mechanisms of adhesive contact, the study of the adhesive ability of different substances and the control of adhesion in various technological processes and ensuring the necessary adhesive strength of joints is a multifaceted problem in the fields of engineering and technology. The article discusses the concept of «adhesion» and the basic theory of adhesion coupled interactions, based on various approaches.Molecular, which is also called adsorptive; diffusion, mechanical, chemical, electrical, relaxation, weak boundary layer. There is no universality in explaining certain processes of the formation of adhesive joints.Adhesive joints formed during milk processing are undesirable and lead to product losses and a violation of the sanitary and hygienic state of production. This is due to the formation of protein, fat and combined contaminants on the surfaces of various equipment. Accordingly, deep scientific and practical research is required both to study the mechanisms of the formation of adhesive joints and to remove them.
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Hanein, D., H. Sabanay, L. Addadi i B. Geiger. "Selective interactions of cells with crystal surfaces. Implications for the mechanism of cell adhesion". Journal of Cell Science 104, nr 2 (1.02.1993): 275–88. http://dx.doi.org/10.1242/jcs.104.2.275.
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In this study we have characterized the mode of cell adhesion to calcite and calcium (R,R)-tartrate tetrahydrate crystals. The use of crystals as adhesion substrata was motivated by their well-established chemical nature and structurally defined surfaces. We show that calcite binds A6 Xenopus laevis epithelial cells rapidly and efficiently, most likely via surface-adsorbed proteins. Surface topology had only a limited effect on the adhesive interactions. Calcium (R,R)-tartrate tetrahydrate crystals exhibits two chemically equivalent, yet structurally distinct faces that differ mainly in the surface distribution of their lattice water molecules and charges. However, despite the gross similarity between the two faces striking differences were noted in their adhesive behavior. One of the faces was highly adhesive for cells, leading to protein-independent attachment and spreading followed by cell death. In contrast, cell adhesion to the other surface of tartrate was slow (> 24 h) and apparently mediated by RGD-containing protein(s). It was further shown that the latter face of tartrate crystals could be “conditioned” by long (24 h) incubation with serum-containing medium, after which it becomes highly adhesive. The results presented here indicate that crystal surfaces may serve as excellent, structurally defined, substrata for cell adhesion, that cell binding may occur directly or via RGD-containing proteins and that cell adhesion may be dramatically modulated by variations in surface structure. The implications of the results to the mechanism of cell-substratum adhesion are discussed.
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Zeng, Zhiwen, i Xiumei Mo. "Rapid in situ cross-linking of hydrogel adhesives based on thiol-grafted bio-inspired catechol-conjugated chitosan". Journal of Biomaterials Applications 32, nr 5 (listopad 2017): 612–21. http://dx.doi.org/10.1177/0885328217738403.
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In this paper, a novel chitosan derivative, thiol-grafting bio-inspired catechol-conjugated chitosan was synthesized. The chemical structure of the synthesized catechol-conjugated chitosan was verified by 1H NMR, and its contents of thiol group and catechol group were determined by UV-vis spectrum. Four percent of catechol-conjugated chitosan aqueous solution could form hydrogels rapidly in situ in 1 min or less with the addition of sodium periodate. Rheological studies showed that the mechanical properties depend on the concentrations of catechol-conjugated chitosan and the molar ratio of sodium periodate to catechol groups. Additionally, the adhesive properties of the resulting adhesives were evaluated, and the adhesion strength of obtained adhesives was as high as 50 kPa because of the complex and multiple interactions, especially the anti-oxidation mechanism of thiol group. The in vitro cytotoxicity assays demonstrated an excellent biocompatibility of the catechol-conjugated chitosan hydrogels. Benefiting from the in situ fast cured, desired mechanical strength, biocompatibility and relatively high adhesion performance, these properties suggested that catechol-conjugated chitosan hydrogel adhesives have potential applications as tissue adhesive for soft tissues.
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Lim, Yaw-Chyn, Karen Snapp, Geoffrey S. Kansas, Raymond Camphausen, Han Ding i Francis W. Luscinskas. "Important Contributions of P-Selectin Glycoprotein Ligand-1-Mediated Secondary Capture to Human Monocyte Adhesion to P-Selectin, E-Selectin, and TNF-α-Activated Endothelium Under Flow In Vitro". Journal of Immunology 161, nr 5 (1.09.1998): 2501–8. http://dx.doi.org/10.4049/jimmunol.161.5.2501.
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Abstract In this study, an in vitro flow model and a blocking mAb to P-selectin glycoprotein ligand-1 (PSGL-1) were used to define the role of PSGL-1 in monocyte attachment and rolling on E- and P-selectin and in attachment and accumulation on 6-h TNF-α-activated HUVEC. KPL1, an adhesion-blocking mAb directed against the tyrosine sulfate motif of PSGL-1, abolished monocyte-adhesive interactions with P-selectin, but only partially blocked monocyte interaction with E-selectin. Further analysis showed that on E-selectin, KPL1 blocked only secondary (i.e., monocyte/monocyte) interactions, but did not block primary (i.e., monocyte/E-selectin) interactions, with secondary adhesion accounting for 90% of the total adhesive interactions on either E- or P-selectin. On cytokine-activated HUVEC, monocytes initially attached and formed linear strings of adherent cells, which involved both primary and secondary adhesion. PSGL-1 or L-selectin mAb reduced string formation, and the combination of PSGL-1 and L-selectin mAb prevented monocyte strings and inhibited 86% of accumulation. Monocyte attachment and rolling on purified adherent monocytes were also critically dependent on PSGL-1 on the adherent monocytes. These studies document that secondary interactions between monocytes, mediated by PSGL-1, are crucial for monocyte initial attachment, rolling, and accumulation on activated endothelium under laminar shear flow.
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Chang, Zhiwei, Huiwen Pang, Anmin Huang, Jianzhang Li i Shifeng Zhang. "Reinforcement of Bonding Strength and Water Resistance of Soybean Meal-Based Adhesive via Construction of an Interactive Network from Biomass Residues". Polymers 11, nr 6 (3.06.2019): 967. http://dx.doi.org/10.3390/polym11060967.
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Soybean meal-based adhesives are attractive potential environmentally friendly replacements for formaldehyde-based adhesives. However, the low strength and poor water resistance of soybean meal-based adhesives limit their practical application. This study was conducted to develop a natural fiber-reinforced soybean meal-based adhesive with enhanced water resistance and bonding strength. Pulp fiber (PF), poplar wood fiber (WF), and bagasse fiber (BF) were added as fillers into the soybean meal-based adhesive to enhance its performance via hydrogen bonding between the PF and the soybean meal system. The enhanced adhesive exhibited a strong crosslinking structure characterized by multi-interfacial interactions wherein PF served as a bridging ligament and released residual stress into the crosslinking network. The crosslinked structure and improved interfacial interactions were confirmed by Fourier transform infrared (FTIR) spectrophotometry, thermogravimetric analysis (TGA), and scanning electron microscopy (SEM) measurements. Plywood bonded with 4 wt % PF-containing soybean meal-based adhesive exhibited a wet shear strength (1.14 MPa) exceeding that of plywood bonded with the control group by 75.4% due to the stable crosslinking network having efficiently transformed stress and prevented the permeation of water molecules.
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Magina, Sandra, Nuno Gama, Luísa Carvalho, Ana Barros-Timmons i Dmitry Victorovitch Evtuguin. "Lignosulfonate-Based Polyurethane Adhesives". Materials 14, nr 22 (21.11.2021): 7072. http://dx.doi.org/10.3390/ma14227072.
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The feasibility of using lignosulfonate (LS) from acid sulphite pulping of eucalyptus wood as an unmodified polyol in the formulation of polyurethane (PU) adhesives was evaluated. Purified LS was dissolved in water to simulate its concentration in sulphite spent liquor and then reacted with 4,4′-diphenylmethane diisocyanate (pMDI) in the presence or absence of poly(ethylene glycol) with Mw 200 (PEG200) as soft crosslinking segment. The ensuing LS-based PU adhesives were characterized by infrared spectroscopy and thermal analysis techniques. The adhesion strength of new adhesives was assessed using Automated Bonding Evaluation System (ABES) employing wood strips as a testing material. The results showed that the addition of PEG200 contributed positively both to the homogenization of the reaction mixture and better crosslinking of the polymeric network, as well as to the interface interactions and adhesive strength. The latter was comparable to the adhesive strength recorded for a commercial white glue with shear stress values of almost 3 MPa. The optimized LS-based PU adhesive formulation was examined for the curing kinetics following the Kissinger and the Ozawa methods by non-isothermal differential scanning calorimetry, which revealed the curing activation energy of about 70 kJ·mol−1.
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Murakami, S., i H. Okada. "Lymphocyte-Fibroblast Interactions". Critical Reviews in Oral Biology & Medicine 8, nr 1 (styczeń 1997): 40–50. http://dx.doi.org/10.1177/10454411970080010201.
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Chronic inflammatory reactions are usually characterized by inflammatory cell accumulation in the extravascular connective tissue. In such sites, inappropriate activation of circulating or resident lymphocytes becomes self-perpetuating and can lead to chronic tissue destruction. In addition to that, the locally infiltrated lymphocytes should have an opportunity to interact directly with fibroblasts composing the connective tissue. The direct interactions of those different cell types seem to play important roles in lymphocyte lodging and retention in such sites. Thus, for clarification of the immunopathogenesis of the chronic inflammatory diseases, including periodontitis, it is important that the molecular mechanisms involved in the heterotypic cell-cell interactions be revealed. In fact, it has been demonstrated that lymphocytes interact with various non-hematopoietic cells, such as epithelial cells and endothelial cells. Regarding interactions with fibroblasts, it has been shown that IFNγ-stimulated fibroblasts can regulate the proliferative responses of T-lymphocytes both positively and negatively. Furthermore, activated lymphocytes have demonstrated strong binding ability to various fibroblast cell lines. Blocking experiments utilizing monoclonal antibodies specific to various cell adhesion molecules revealed that very late antigen (VLA) integrins, lymphocyte-function-associated antigen (LFA-1)/intercellular adhesion molecule-1 (ICAM-1), CD44/hyarulonate are, at least in part, involved in lymphocyte-fibroblast interactions. In addition, recent findings raised the possibility that the adhesive interactions between lymphocytes and fibroblasts influenced the various cellular functions of each cell type. In fact, it was recently demonstrated that the adhesive interactions stimulated fibroblasts to increase expression of inflammatory cytokine mRNA. These results strongly suggest that fibroblasts are not merely innocent bystanders but actively participate in local inflammatory reactions by directly interacting with locally infiltrated lymphocytes.
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Huang, Yujian, Yongzhong Wang, Li Tan, Leming Sun, Jennifer Petrosino, Mei-Zhen Cui, Feng Hao i Mingjun Zhang. "Nanospherical arabinogalactan proteins are a key component of the high-strength adhesive secreted by English ivy". Proceedings of the National Academy of Sciences 113, nr 23 (23.05.2016): E3193—E3202. http://dx.doi.org/10.1073/pnas.1600406113.
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Over 130 y have passed since Charles Darwin first discovered that the adventitious roots of English ivy (Hedera helix) exude a yellowish mucilage that promotes the capacity of this plant to climb vertical surfaces. Unfortunately, little progress has been made in elucidating the adhesion mechanisms underlying this high-strength adhesive. In the previous studies, spherical nanoparticles were observed in the viscous exudate. Here we show that these nanoparticles are predominantly composed of arabinogalactan proteins (AGPs), a superfamily of hydroxyproline-rich glycoproteins present in the extracellular spaces of plant cells. The spheroidal shape of the AGP-rich ivy nanoparticles results in a low viscosity of the ivy adhesive, and thus a favorable wetting behavior on the surface of substrates. Meanwhile, calcium-driven electrostatic interactions among carboxyl groups of the AGPs and the pectic acids give rise to the cross-linking of the exuded adhesive substances, favor subsequent curing (hardening) via formation of an adhesive film, and eventually promote the generation of mechanical interlocking between the adventitious roots of English ivy and the surface of substrates. Inspired by these molecular events, a reconstructed ivy-mimetic adhesive composite was developed by integrating purified AGP-rich ivy nanoparticles with pectic polysaccharides and calcium ions. Information gained from the subsequent tensile tests, in turn, substantiated the proposed adhesion mechanisms underlying the ivy-derived adhesive. Given that AGPs and pectic polysaccharides are also observed in bioadhesives exuded by other climbing plants, the adhesion mechanisms revealed by English ivy may forward the progress toward understanding the general principles underlying diverse botanic adhesives.
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Joo, Sung-Min, Young-Gon Kim, Young-Jin Kwak, Dong Jin Yoo, Chang-U. Jeong, Jeshin Park i Min-Suk Oh. "Enhanced Long-Term Reliability of Seal DeltaSpot Welded Dissimilar Joint between 6061 Aluminum Alloy and Galvannealed Steel via Excimer Laser Irradiation". Materials 14, nr 22 (9.11.2021): 6756. http://dx.doi.org/10.3390/ma14226756.
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Structural-adhesive-assisted DeltaSpot welding was used to improve the weldability and mechanical properties of dissimilar joints between 6061 aluminum alloy and galvannealed HSLA steel. Evaluation of the spot-weld-bonded surfaces from lap shear tests after long-term exposure to chloride and a humid atmosphere (5% NaCl, 35 °C) indicated that the long-term mechanical reliability of the dissimilar weld in a corrosive environment depends strongly on the adhesive–Al6061 alloy bond strength. Corrosive electrolyte infiltrated the epoxy-based adhesive/Al alloy interface, disrupting the chemical interactions and decreasing the adhesion via anodic undercutting of the Al alloy. Due to localized electrochemical galvanic reactions, the surrounding nugget matrix suffered accelerated anodic dissolution, resulting in an Al6061-T6 alloy plate with degraded adhesive strength and mechanical properties. KrF excimer laser irradiation of the Al alloy before adhesive bonding removed the weakly bonded native oxidic overlayers and altered the substrate topography. This afforded a low electrolyte permeability and prevented adhesive delamination, thereby enhancing the long-term stability of the chemical interactions between the adhesive and Al alloy substrate. The results demonstrate the application of excimer laser irradiation as a simple and environmentally friendly processing technology for robust adhesion and reliable bonding between 6061 aluminum alloy and galvannealed steel.
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Cavezza, Francesca, Matthieu Boehm, Herman Terryn i Tom Hauffman. "A Review on Adhesively Bonded Aluminium Joints in the Automotive Industry". Metals 10, nr 6 (1.06.2020): 730. http://dx.doi.org/10.3390/met10060730.
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The introduction of adhesive bonding in the automotive industry is one of the key enabling technologies for the production of aluminium closures and all-aluminium car body structures. One of the main concerns limiting the use of adhesive joints is the durability of these system when exposed to service conditions. The present article primarily focuses on the different research works carried out for studying the effect of water, corrosive ions and external stresses on the performances of adhesively bonded joint structures. Water or moisture can affect the system by both modifying the adhesive properties or, more importantly, by causing failure at the substrate/adhesive interface. Ionic species can lead to the initiation and propagation of filiform corrosion and applied stresses can accelerate the detrimental effect of water or corrosion. Moreover, in this review the steps which the metal undergoes before being joined are described. It is shown how the metal preparation has an important role in the durability of the system, as it modifies the chemistry of the substrate’s top layer. In fact, from the adhesion theories discussed, it is seen how physical and chemical bonding, and in particular acid-base interactions, are fundamental in assuring a good substrate/adhesive adhesion.
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Hasan, Salah Mohamed. "Adhesive Interactions between Gelatinised Starch Granules". International Journal of Nutrition and Food Sciences 2, nr 4 (2013): 207. http://dx.doi.org/10.11648/j.ijnfs.20130204.18.
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RÖSEN, P., B. SCHWIPPERT i D. TSCHÖPE. "Adhesive proteins in platelet-endothelial interactions". European Journal of Clinical Investigation 24, S1 (luty 1994): 21–24. http://dx.doi.org/10.1111/j.1365-2362.1994.tb02421.x.
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BROWN, E. "Adhesive interactions in the immune system". Trends in Cell Biology 7, nr 7 (lipiec 1997): 289–95. http://dx.doi.org/10.1016/s0962-8924(97)01076-3.
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McCormick, Beth A., i Bruce R. Zetter. "Adhesive interactions in angiogenesis and metastatasis". Pharmacology & Therapeutics 53, nr 2 (styczeń 1992): 239–60. http://dx.doi.org/10.1016/0163-7258(92)90011-n.
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López-Suevos, Francisco, i Charles E. Frazier. "Rheology of latex films bonded to wood: influence of cross-linking". Holzforschung 60, nr 1 (1.01.2006): 47–52. http://dx.doi.org/10.1515/hf.2006.009.
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Abstract Parallel-plate rheological analysis was conducted on two types of cross-linking poly(vinyl acetate) latex films: dry freestanding films, and dry films bonded directly to wood (composites). For each sample type, three levels of cross-linking were used: (1) little or no cross-linking of unaltered latex; (2) substantial cross-linking through AlCl3 catalysis of N-methylolacrylamide co-monomer; and (3) greater cross-linking from a phenol-formaldehyde resol additive, in addition to AlCl3 catalysis. Simple thermal scans revealed a strong wood/adhesive interaction; wood increased the base polymer T g by ∼5°C in all adhesives. Relative to the simple thermal scans, time-temperature master curves provided more insight and information about the wood/adhesive interaction. Storage modulus and tan δ master curves both indicated that wood retarded adhesive cross-linking. Using time-temperature superposition, a segmental coupling analysis demonstrated that wood actually narrowed the breadth of the glass transition, or reduced segmental coupling. Cross-linking influenced segmental coupling, but in a fashion that was dependent on the presence or absence of wood. Wood-induced reductions in cross-linking and in segmental coupling were attributed to the diffusion of water-soluble reactive compounds away from the adhesive layer and into the bulk wood. Time/temperature equivalence provides a sensitive means to detect interactions between wood and viscoelastic adhesives.
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Freedman, AS, JM Munro, C. Morimoto, BW McIntyre, K. Rhynhart, N. Lee i LM Nadler. "Follicular non-Hodgkin's lymphoma cell adhesion to normal germinal centers and neoplastic follicles involves very late antigen-4 and vascular cell adhesion molecule-1". Blood 79, nr 1 (1.01.1992): 206–12. http://dx.doi.org/10.1182/blood.v79.1.206.206.
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Abstract Follicular lymphomas recapitulate the architecture of germinal centers (GCs) of normal secondary lymphoid follicles. Using an in vitro binding assay, it has recently been demonstrated that the normal B lymphocytes bind to GCs. This interaction is mediated by a receptor-ligand pair consisting of the beta 1 integrin very late antigen 4 (VLA-4) on the B cell, and the vascular cell adhesion molecule-1 (VCAM-1) expressed on follicular dendritic cells (FDC). Considering the similarities between follicular lymphomas and normal GCs, the adhesive interaction of follicular non-Hodgkin's lymphoma (NHL) cells and GCs was examined. Cells isolated from 16 of 24 cases of follicular NHL bound to normal GCs. Neoplastic follicles could similarly support the binding of follicular NHL cells. This adhesion was inhibited by monoclonal antibodies (MoAbs) directed against VLA-4 and VCAM-1. This supports the hypothesis that the neoplastic follicles used the identical adhesive interactions responsible, at least in part, for the localization of normal B cells to GCs. Adhesion receptors have an important role in the regulation of normal lymphoid cell proliferation, differentiation, and localization. Therefore, an understanding of the adhesive interaction of follicular NHL cells with GCs may provide insight into the clinical and biologic behavior of these diseases.
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Freedman, AS, JM Munro, C. Morimoto, BW McIntyre, K. Rhynhart, N. Lee i LM Nadler. "Follicular non-Hodgkin's lymphoma cell adhesion to normal germinal centers and neoplastic follicles involves very late antigen-4 and vascular cell adhesion molecule-1". Blood 79, nr 1 (1.01.1992): 206–12. http://dx.doi.org/10.1182/blood.v79.1.206.bloodjournal791206.
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Follicular lymphomas recapitulate the architecture of germinal centers (GCs) of normal secondary lymphoid follicles. Using an in vitro binding assay, it has recently been demonstrated that the normal B lymphocytes bind to GCs. This interaction is mediated by a receptor-ligand pair consisting of the beta 1 integrin very late antigen 4 (VLA-4) on the B cell, and the vascular cell adhesion molecule-1 (VCAM-1) expressed on follicular dendritic cells (FDC). Considering the similarities between follicular lymphomas and normal GCs, the adhesive interaction of follicular non-Hodgkin's lymphoma (NHL) cells and GCs was examined. Cells isolated from 16 of 24 cases of follicular NHL bound to normal GCs. Neoplastic follicles could similarly support the binding of follicular NHL cells. This adhesion was inhibited by monoclonal antibodies (MoAbs) directed against VLA-4 and VCAM-1. This supports the hypothesis that the neoplastic follicles used the identical adhesive interactions responsible, at least in part, for the localization of normal B cells to GCs. Adhesion receptors have an important role in the regulation of normal lymphoid cell proliferation, differentiation, and localization. Therefore, an understanding of the adhesive interaction of follicular NHL cells with GCs may provide insight into the clinical and biologic behavior of these diseases.
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Ong, Huei Ruey, Reddy Prasad, Md Maksudur Rahman Khan i Md Najmul Kabir Chowdhury. "Effect of Palm Kernel Meal as Melamine Urea Formaldehyde Adhesive Extender for Plywood Application: Using a Fourier Transform Infrared Spectroscopy (FTIR) Study". Applied Mechanics and Materials 121-126 (październik 2011): 493–98. http://dx.doi.org/10.4028/www.scientific.net/amm.121-126.493.
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Increased demand for wood adhesives, environmental concerns, and the uncertainty of continuing availability of petrochemicals have led to recent attention on protein-based adhesives. This study was conducted to investigate the physico-chemical interaction of palm kernel meal (PKM) with melamine urea formaldehyde (MUF) resins in adhesive formulation by using Fourier Transform Infrared (FTIR) Spectroscopy. The effect of hot press on PKM extender has been investigated by FTIR and blue shift is observed due to the hot press indicating that the functional groups (such as C=O, -OH and NH) are become more free in the samples. In the case of PKM-MUF blend bonding interactions observed where, PKM played the role as an extender. Red shift of C=O and N-H groups stretching in PKM-MUF-Wood blend is observed which suggests the interaction of these functional groups through hydrogen bonding. The results suggest that PKM extender-based MUF adhesive resins have potential application for the production of exterior plywood.
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Pastor-Blas, M. Mercedes, José Miguel Martín-Martínez i F. J. Boerio. "Mechanisms of Adhesion in Surface Chlorinated Thermoplastic Rubber/Thermoplastic Polyurethane Adhesive Joints". Rubber Chemistry and Technology 75, nr 5 (1.11.2002): 825–38. http://dx.doi.org/10.5254/1.3547686.
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Abstract Chlorination of a thermoplastic styrene-butadiene-styrene rubber (S0) with a solution of 2 wt% trichloroisocyanuric acid (TCI) in ethyl acetate improved its adhesion to polyurethane adhesives. The analysis of the failed surfaces (obtained after T-peel test of S0/PU joints) showed that the locus of failure in the rubber/polyurethane joints progresses from adhesion (in non chlorinated-S0/PU joint) to cohesion in the chlorinated layer (for chlorinated-S0/PU joint). The composition of this chlorinated layer differed from the composition of the non bonded-chlorinated rubber, i.e. the failure of the joint was located in a chlorinated layer with a distinctive chemistry. On the other hand, the analysis of the chlorinated rubber/PU adhesive interface showed that chlorination with TCI produces a crosslinking of the rubber surface as well as strong interactions between the uppermost-chlorinated layer and the PU adhesive.
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Hogan, Kayla, Sai Paul, Guanyou Lin, Jay Fuerte-Stone, Evgeni V. Sokurenko i Wendy E. Thomas. "Effect of Gravity on Bacterial Adhesion to Heterogeneous Surfaces". Pathogens 12, nr 7 (15.07.2023): 941. http://dx.doi.org/10.3390/pathogens12070941.
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Bacterial adhesion is the first step in the formation of surface biofilms. The number of bacteria that bind to a surface from the solution depends on how many bacteria can reach the surface (bacterial transport) and the strength of interactions between bacterial adhesins and surface receptors (adhesivity). By using microfluidic channels and video microscopy as well as computational simulations, we investigated how the interplay between bacterial transport and adhesivity affects the number of the common human pathogen Escherichia coli that bind to heterogeneous surfaces with different receptor densities. We determined that gravitational sedimentation causes bacteria to concentrate at the lower surface over time as fluid moves over a non-adhesive region, so bacteria preferentially adhere to adhesive regions on the lower, inflow-proximal areas that are downstream of non-adhesive regions within the entered compartments. Also, initial bacterial attachment to an adhesive region of a heterogeneous lower surface may be inhibited by shear due to mass transport effects alone rather than shear forces per se, because higher shear washes out the sedimented bacteria. We also provide a conceptual framework and theory that predict the impact of sedimentation on adhesion between and within adhesive regions in flow, where bacteria would likely bind both in vitro and in vivo, and how to normalize the bacterial binding level under experimental set-ups based on the flow compartment configuration.